I used to write the worst Mary Sues ever. And the worst original characters. I also glamorized my character in SIs. Now I stick to my strengths and tend not to write original characters. I also embrace the flaws of myself in my SIs and that tends to make the entire story.
I had a My Chem story once where Mikey got raped and then a few days later he kissed Frankie, even though he was still tramautized from the rape! It's unrealistic and
stupid. I would never do that again.
I know that a lot of people actually really like the story
Nevermore, but I hate the ending. I think it's too quick, too abrupt, and overdramatic. If I had to do it over, I probably would have changed the last few paragraphs.
Also, one of my stories in a fandom a long time ago [I was twelve] was a blatant rip-off of another story. It was never posted anywhere, so there was no one to tell me what an idiot I was. I pretty much stole the plot and changed one or two things. Now I get inspired by all sorts of outside sources, but I understand the difference between plagiarism and inspiration. I mean, I've been plagiarized. So I'm glad I never posted that rip-off story I wrote a long time ago. [I didn't know what plagiarism was at the time.]